It almost got lost in all the iPhone OS 4.0 stuff, but Apple made a major contribution to the WebKit project yesterday. It's called WebKit 2, and it adds multiprocess browsing to the WebKit API; it may look similar to what Chromium does, but the difference is that Chromium's process boundary is not actually part of WebKit.

"Of course, because Apple has never, ever released any open source code unless they started with something already covered by the GPL /rollseyes.

Like they ever written something from scratch and release it under GPL? You got to be kidding. "
I'm not actually sure, but didn't they write Grand Central Dispatch from scratch and then release libdispatch under BSD? Maybe my sarcasm detector is just on the fritz.